Apa itu Windows PowerShell dan apa yang dimakannya? Bagian 2: Pengantar bahasa pemrograman

Daftar Isi:

Komentar

#       —     .

<# 

             . 
            .

#>

Variabel dan tipenya

$test = 100

[int]$test = 100

$test = [int]100

$test.GetType().FullName

Get-Command -Noun Variable | ft -Property Name, Definition -AutoSize -Wrap

Get-Variable | more

Variabel sistem

$PWD.Path

Get-ChildItem Variable: | more

ls Variable: | more

Lingkup

$Global:test = 100

Variabel Lingkungan

dir Env:

$env:TEST = "Hello, World!"

Operator aritmatika dan pembanding

Operator Penugasan

Operator logis

("" -eq "") -and (100 -eq 100)

-not (123 -gt 321) 

!(123 -gt 321)

Lompat bersyarat

[int]$test = 100
if ($test -eq 100) {
      Write-Host "test = 100"
}



[int]$test = 50
if ($test -eq 100) {
       Write-Host "test = 100"
}
else {
      Write-Host "test <> 100"
}



[int]$test = 10
if ($test -eq 100) {
      Write-Host "test = 100"
}
elseif ($test -gt 100) {
      Write-Host "test > 100"
}
else {
       Write-Host "test < 100"
}



[int]$test = 5
switch ($test) {
     0 {Write-Host "test = 0"}
     1 {Write-Host "test = 1"}
     2 {Write-Host "test = 2"}
     3 {Write-Host "test = 3"}
     4 {Write-Host "test = 4"}
     5 {Write-Host "test = 5"}
     default {Write-Host "test > 5    "}
}

Siklus

[int]$test = 0
while ($test -lt 10) {
      Write-Host $test
      $test = $test + 1
}

[int]$test = 0
do {
      Write-Host $test
      $test = $test + 1 
}
while ($test -lt 10)



[int]$test = 0
do {
      Write-Host $test
      $test = $test + 1 
}
until ($test -gt 9)

for ([int]$test = 0; $test -lt 10; $test++) {
       Write-Host $test
}

$test_collection = "item1", "item2", "item3"
foreach ($item in $test_collection)
{
        Write-Host $item
}

Array

$test_array = @() #  

$test_array = @(1, 2, 3, 4) #      

$test_array = 1, 2, 3, 4

$test_array = , 1

$test_array[0] = 1

$test_array = "", "", "", ""
$test_array[0,1,2,3]
$test_array[1,1,3,3,0]

$test_array = "", "", "", ""
$test_array[0..2]
$test_array[2..0]
$test_array[-1..0]
$test_array[-2..1]

$test_array[0..100]

$test_array = 1, 2, "", 3, 4
for ([int]$i = 0; $i -lt $test_array.count; $i++)
{
          Write-Host $test_array[$i]
}

[int[]]$test_array = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Tabel hash

$test_hashtable = @{}

$test_hashtable = @{one=""; two=""; three=""; "some key"="some value"}

$test_hashtable."some key"
$test_hashtable["some key"]
$test_hashtable.Add("four", "")
$test_hashtable.five = ""
$test_hashtable['five'] = " "
$test_hashtable.Remove("one")

Fungsi

function - (1, ..., N) 
{ 
        - 
} 

function sqr ($number)
{
      return $number * $number
}

sqr 2

sqr -number 2

function test_func ($n) {}
test_func -eq $null     #   
(test_func) -eq $null   #   — $true

function func ($arg = value) {
         # 
}

Galat saat memproses

try {

        [int]$test = Read-Host " "
        100 / $test

} catch {

         Write-Warning " "
         Write-Host $_

}